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What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
How do you identify beta decay?
A sample of 187 rhenium decays to 187-omium with halflife of 41.6 billion years. If all 188 osmium are normalized isotopes.
When is chromatography found in everyday life?
It is used every day by analytical scientist to find out the amount of substance in a sample.
The sample in the evaporting dish is not heated to dryness how will this affect the reported valye for total solids?
If the sample is not heated to dryness, the reported value for total solids will be lower than the actual value. This is because the remaining moisture in the sample will contribute to the weight measured, erroneously inflating the value for total solids.
A scientist has analyzed the chemicals that make of a sample of an unknown substance. Which chemicals would be the best indicator that the unknown substance is a plant?
cellulose and starch
The halflife of Na24 is 15 hours When there are 1000 atoms of Na24 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 45 hours there are atoms of Na24 rema?
There will be 125 atoms of Na24 remaining in the sample after 45 hours. This calculation is based on the fact that after 3 half-lives (45 hours/15 hours per half-life), the original 1000 atoms would have reduced by a factor of 2 three times, resulting in 1000/2/2/2 = 125 atoms remaining.
The half-life of Na-24 is 15 hours When there are 1000 atoms of Na-24 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 45 hours there are atoms of Na-24 remaining?
Based on the half-life of Na-24, after 1 half-life (15 hours), there would be 500 atoms remaining. After 2 half-lives (30 hours), there would be 250 atoms remaining. After 3 half-lives (45 hours), there would be 125 atoms remaining in the sample.
The half-life of Au-198 is 2.7 days When there are 800 atoms of Au-198 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 8.1 days there are atoms of Au-198 re?
At 2.7 days, half of the 800 atoms (400 atoms) would have decayed. At 8.1 days, three half-lives have passed, so only ( \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8} ) of the original sample remains. Therefore, there are 100 atoms of Au-198 remaining in the sample after 8.1 days.
The half life of Au198 is 2 7 days When there are 800 atoms of Au198 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 8 1 days there are atoms of Au198 rema?
At 8.1 days, 400 atoms of Au198 would remain in the sample. This is because after 8.1 days, two half-lives of Au198 have passed, reducing the initial 800 atoms to 400.
What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
How do you identify beta decay?
A sample of 187 rhenium decays to 187-omium with halflife of 41.6 billion years. If all 188 osmium are normalized isotopes.
What can the scientist conclude from a scientist finds fossae on a bone sample?
This bone had nerve running through it.
A scientist find fossae on a bone sample. what can the scientist conclude?
This bone was near blood vessels or organs.
A scientist studying humus would most likely examine a sample of what?
Soil
Can a scientist tell from DNA result alone what type of DNA sample were used in the test i.e. is it from blood or semen sample?
Yes, because each DNA is unique and and the scientist can just match the DNA up with andother DNA.
A scientist suspect that a mineral sample is a carbonate. which useful for identifying the sample as a carbonate?
To identify the mineral sample as a carbonate, the scientist can perform an acid test. If the sample fizzes or produces bubbles when acid is added, it indicates the presence of carbonate minerals. Additionally, spectroscopic analysis can be used to detect the specific chemical composition of the mineral, confirming its classification as a carbonate.
